Spring suspension for vehicles



D. l, l925 1,563.547 R. Y. BOVEE SPRING SUSPENSION FOR VEHICLES Filed Oct'. 22, 1924 2 Sheets-Sheet 1 IN VEN TOR. a/Lfjode De.1,1925. y 1,563,547 R. Y. BOVEE SPRING SUSPENSION FOR VEHICLES Filed Oct, 22. 1924 2 Sheet$-$heet 2 Patented Dec. l, 1925.

UNITED lsri-iras' PATENT orifice.

RANSOM Y. BOVEE, OF MAYWOOD, ILLINOIS, `ASSIGNOR TO BOVEE TRANSMISSION CORPORATION, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

SPRING SUSPENSION FOR VEHICLES.

Application filed October 22, 1924.

To ZZ flo/om t may concern.'

Be it known that I, RANsoM Y. Boven, a citizen of the United States, residing at ll/iaywood, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Spring Suspensions for Vehicles, of which the following is a specification.

This invention relates to in'iprovements in spring suspension for vehicles, and one of the objects of the same is to provide an improved suspension free from latent spring` friction usual in leaf spring construction, and in which latter the spring action is maintained by a series of springs whose lateral defiection is only accomplished by the sliding of one spring on top of another under the sluggish resistance produced thereby.

In the present invention there is provided a coil spring suspension in which there is no frictional engagement action in the movement of the spring and further action is supplemented through a compound leverage suspension of weight, balancing or opposing the force of shocks with a reverse thrust through compound levers, creating an opposing action equivalent to the original thrust or shock delivered upon the wheels of the vehicle.

This invention further provides a swiveling movement between the vehicle frame supporting bracket and the compound leverage weight supporting arms or levers, permitting of a fixed are of motion Vbetween the vehicle frame and the tie rods which attach the axle member and springs to the vehicle without having to bend or deflect any of the solid mechanism of the spring structure. The weight supporting coil springs being flexible with reference to a relative deflection or turning action upon the arms permits the compound leverage supporting member to be moved upon a universal pivot support, giving the arm both lateral sliding and swivel actions thereabout in both directions of pivotal rotation.

To the attainment of these ends and the :u'complishment of other' new and useful objects as will appear, the invention consists in the features of novelty in substartially the construction, combination and arrangement of the several parts hereinafterlnore fully described and claimed and shown Serial No. 745,175.

in the accompanyingdrawings illustrating this invention, and in which Figure 1 is a perspective view of a spring 'suspension of this character constructed in accordance with the principles of this invention.

Figure 2 is an enlarged detail View partly in elevation, partly in section and with parts broken away, showing the inner ends of the weight supporting arms and the mechanism associated. therewith.

Figure 3 is an enlarged detail view partly in elevation and partly taken on line 3-3, of Figure 1.

Figure 4 is a detail View taken on line 4 4@ Figure 3.

Figure is a detail view partly in elevation and partly in section of one of the bearing members for the inner end of one of the weight supporting arms.

Figure 6 is a left hand end elevation of Figure 5.

Referring more particularly to the drawings the numeral 10 designates generally a hanger which is connected in any suitable manner with aportion of the chassis 11 of the vehicle or may, if desired, constitute a portion of the chassis. Depending below the member 10 and centrally thereof are spaced projections 12-13 constituting bearings for a tubular shaft or member 14, the latter being held against displacement and rotation with respect thereto in any suitable manner such as by means of fastening de vices 15. This member 14 is provided with la channel 16 extending therethrough, and ports 17 communicating with the channel 16 extend through the side of the member 14 to permit lubrication, which is inserted in one end, to be supplied to the members which have bearings upon the shaft or member 14, and to be hereinafter described. The inlet end of the channel 16 may be closed in any suitable manner such as by means of a lubrication or grease cup 18, and the other end thereof is closed preferably by means of a plug 19. Y

Disposed 'below the member 10 are arms or levers 20, one end of each of which is pivotally connected as at 21 with a fixed portion of the vehicle structure. As the construction of each of these arms 2() is the same, the description of one will apply equally as well to them both. l

A The inner end ot the arm is preferably biurcated as at 22 and disposed within the bifurcation is a collar 23 and through which collar the shaft or member 14 passes, the collar being mounted loosely thereupon. A member' 24 is also disposed within the bi,- furcation 22 and has bearings in the walls j 'forming the biturcated portion of the arm' 20. The collar 23 is journaled in the member 24 and the shali't or member 14 also passes through this member 24, so that the end of the arm 2O will be connected with the shaft 14 tor movements in directions lengthwise of the member 14, and also in a manner that the arm 2O may be moved laterally with respect to the shaft or member 14, dui-ine` which movement the collar 23 will rotate about the member 14.

interposed between each of the collars andthe respective bearings 12 and 13 ot the member 10, are springs 25;v one end of each ot which abuts the collar 23 and the other end the respective bearings 12H13. rllhese springs 25 tend normallyv to move the ends of the arms 2O in directions lengthwise of the shaft or bearing' 14 and toward each other. The arms 2O are o't such a length that ther7 will be normally spaced from each other and the space is of such a size that when the arms 2O are rocked in directions to cause the deflected ends to move towards each other, the ends oit the arms will not be moved into engagement.

lWith this construction it will be noted that the member 14 serves in the capacit-57 of a swivel bar providing for toeu'le action in the movement of the arms 20, permitting' their extremities to approach and recede Ytrom each other as thev are deflected up and down around their circumferential arc ot' pivotal connection at the point 21. This member 14 and the ends ot the arms in connection therewith also provide for a swivel motion of the parts 24, 23 and 2O as a cooperating` unit permitting the arms 20 to be swung' about their pivotal connection with the member 14 in a lateral direction of movement, while also pivoting about the member 24 to permit a relative rotational movement on the member 24 as the members 10 and 2O change their position with resil ect to each other.

interposed between the ends ot the arm 20 is a recess or pocket 2G opening through the upper face thereoi and provided with a projection 27 arising' from the seat of the recess.

Opening' throueh the lower face of the member 10 and above the pocket or recess 26 of the arm 20, is a recess 2S, having a centrallv depending portion 29. An elastic memberV such as a coil spring; 30 vis interposed between the member 10 and arm 20. @ne end of the spring is seated in the recess 26 and encompasses the projection 27, while the other end of the springr is seated in the recess 23 and encompasses the projection 29. This spring 'forms a cushion or resistingl element between the member 1() and arm 20.

The spring` is held against lateral displace nient in anjVT desired or suitable manner but preferablyY b v means ot a tie rod or bolt 31 which passes through the projection 2S), the latter beinfij preferably hollow as at 32, the head 33 ot the bolt- 31 resting' upon the bottoni oli the projection 29. rhis tie rod or bolt ma)Iv be oli an)v desired length andpasses through the projection 27 in the seat 2G oi' the arm-2O to extend below the bottom ot the arm and is provided on its extremityv with threads 34 to receive a nut 35, the latter beine secured against relative movement with respect to the bolt in anv suitable manner, such as by means ct a fasteningl device 3G. A collar 37 is looselyv mounted upon the end ot the bolt 31 and rests upon the nut fr gland 38 ot any,7 suitable material rests upon the colla1 3? and is provided :tor the purpose olf deadeninn the noise between two metallic surtaces. A tubular member 39en- Compasses' the bolt 31 and extends through the projection 29 in the seat- 26 of the arm 21 and projects bevond the projection 27 and into the coil spring 30. The open end of the tubular member 39 rests a0^ainst the washer 33 and a. coil spring 40 is disposed within the tubular member 39 and encompasses the rod or bolt 31. One end of the spring 40 .rests against the bottom of the tubular member 39 and the other endv rests against the washer or gland 38.

The external diameter oit the tubular member 3S) is somewhat less than the internal diameter oi the tubular projection 2T and a coil` spring 4 .is arranged to extend into the projection 2T and encompasses the lower portion oty the tubular member 39. One end ot the sj ring 41 rests against the bottom ot the projection 27 and the other end against a flange 42 on the end ot the tubular projection 39. This spring 41 operates as a snubber to assist in retardinpY or checking the rebound action of the mechanism. The spring 40de provided as a means tor holding the spring- 41 seated. That is to say, when the niernber 10 and the arm 20 are moved toward each other to compress the spring 30, the end ei" the rod or bolt 31 will be projected to a still further extent through the arm 2t) and 325e spring 41 would, if no means were provided to prevent, follow the tubular member l would become unseated from the bottom oit the projection 2T, with the result that when the spring- 30 is expanded, the end of the sprl 40 would be toi-ced against the bottom or the projection 29 and would produce considerable noise. By providing the spring 40 it will be noted that when the spring- 30 is compressed the tie rod or bolt will move'through the arm 2() and the lOl) luf)

spring 41 will be held upon its seat by reason ot the tact that during this movement the spring et() will expand and will hold the tubular member 39 against movement with respect to the arm 20. This is accomplished by reason of the fact that the tie rod 31 will slide through the member 39 and the nut 35 and the washer or gland 38 will move away from the end of the tubular member 39 as the tie rod or bolt 3l passes therethrough. Upon the return movement, the noise will be prevented by reason of the washer' or gland 38 striking` the end of the tubular member 39.

Arranged within the projection 29 is a coil spring 4-3, one end of which rests upon the end oi2 the tie rod or bolt 3l and the other end is engaged by an adjustable plug ist seated in the projection 29 and forming a closure therefor. This tends to hold the tie rod or bolt 3l in a proper position.

It will be noted that the opening in the bottom of the projection 29, through which the rod or bolt 3l passes and tl'ie opening in the bott-omet the projection 27, through which the tubular member 39 passes. are of diameters considerablj7 greater than the diameters otl the parts which pass therethrough. This is provided as a means for permitting a lateral movement ot the arms .20 with respect to the member l0, so as not to interfere with the rotational movement of the ends of the arm 2O upon the shaft or member 14, through the medium ot the collar 23.

lf desired and as a means to lubricate the head 33 of the rod or bolt 31, a suitable lubricant may be placed in the chamber 32 lformed in the projection 29.

In operation when the wheels 45 strike an obstruction there .is an upward thrust exerted upon the vehicle through the coil spring 8O by reason of the tact that the end ot `the arm 20 at the point 2l is thrust upwardly while the inner end of the arm which engagesV the bearing member' 24, is given a downward pull tending to counterbalance the torce et the thrust at the end 21, bringing the opposing weight centrally of the arm upon the member 10. This causes a communicating portion of the downward forces to tendto compress the spring 30, bringing the load supported upon the member l() downward upon an almost horizontal line of action, preventing the usual lateral tipping thrust caused by springs of other types.

The arms 20 bearing downwardly upon the shaft or member 14 normally tend to distribute load weights applied to the member it) wit-hout great tipping action out of the horizontal plane upon the member l0. The result being that loads applied upon one side ol' the member l() having its weights distributed to the opposite side ot the member l0, through the co-operating members 2O and springs 30, gives the member 10 a uniform upward and downward action preventing the usual side swayv in the vehicle body. This will prevent skidding of the vehicle which would be caused by the rocking action usually obtained in other spring suspensions.

The connecting bolts or rods 3l with their cti-operating members act to snub against the unsprung weight carried beneath the springs, tending to apply the unsprung weight to limit and cushion the upward movements of the load carried on the member 10. The opposed actions ot the springs 25 against the arms 2() tend to cause a uniform cushioning tlexating action ot the cooperating springs against unrestricted tieifrations backward and l'orward, giving gradual movements and taking successive rebounds found in other springs, out of the spring` operation.

The springs 25 co-operating with the ends ot' the arms 20 oppose the inner projecting arms and cause them to be maintained in a central position with respect to their relative action and act as compensating elenlents in which the members or bearings 24e may reciprocate bach and torth upon the shaft or member l-i, maintaining them under noiseless spring engaging tension.

This construction permits the arms Q0 to be deflected laterally with respect to the member l() and wiil permit ot' the are movement oi the rear axle caused by the movement ot the vehicle under road conditions and by the connecting rods which usually maintain the axle in position, when the connecting rod swings 'about its point ot' pivotal connection with the body traine.

lVhile the preferred torni ot' the invention has been herein shown and described, it is to` be understood that various changes may be made in the details ot construction and 1n the combination and arrangement of the several parts, within the scope of the claims, without departing trom the spirit ot this invention.

TWhat is claimed'as new is y 1. In a spring suspension for vehicles, a load supporting member, opposed load supporting arms therebelow, means pivotally connecting one end ot the arms tothe said member, means pivotally connecting the other ends of the arm to the vehicle running gear, and elastic means interposed between the arms and the said member to cushion their relative movements, the iirst recited means embodying means to permit longitudinal movement ot the said member and the ends oil' the arms one with relation to the other.

2. In a spring suspension tor vehicles, a loadsupporting member, opposed load supporting arms therebelow, means pivotally connecting one end oi the arms to the said member, means pivotally connecting the l titl' other ends of the arm to the vehicle running' gear, elastic means interposed between the arms and the said member to cushion their relative movements, the iirst recited means embodying means to permit longitudinal movcn'ient of the said member and the ends of the arms one with relation to the other, and resilient means for cushioning Jihe last recited relative movenient.

In a spring suspension tor vehicles, a load supporting member, opposed load supporting arms therebelovf, means 'iivotaliv connecting one end ot' the arms to hc said 'memben means pivotallv connecting' the other end ot the arm to the vehicle running` gear, and elastic means interposed between the arms and the said member to cnshiou their relative moven'ients, the iirst recited means embodying means to permit a longitudinal'and aswiveling movement oi' the said member and the ends ol the arms one with relation to the other.

4t. ln a spring suspension for vehicles, a load supporting member, opposed load snpporting arms tnerebelow, means pivotallv connecting one end oi the arms to the said member, means connectingl the other ends of the arms to the vehicle running gear, and means for cushioning the relative movements of the said arms and the said member, the first recited means including means to permit longitudinal movement of the said member and the ends of the arms one With relation to the other and ope lating to permit a swivel action of the arms and member on an axis common to the direction of the said longitudinal movement.

5. In a spring suspension for vehicles, a load supporting` member, opposed load supporting arms therebelow, means pivotally connecting one end of the arms to the said member, means connecting the other ends of the arms to the vehicle ruiming gear, means for cushioning the relative movements of the said arms and the said member, the first recited means including means to permit longitudinal movement ofthe said member and the ends oi the arms one With relation to the other and operating to permit a swivel action o1E the arms and member on an axis common to the direction of the said longitudinal movement, and additional means for cushioning the said longitudinal movement of the parts.

6. In a spring suspension for vehicles, a load supporting member, opposed load supporting arms therebeloiv, means pivotally connecting one end of the arms to the vehicle ruiming gear, means pivotally and separately connecting the other ends of the said arms to the said member, the last recited means including` means permitting a longitudinal movement oit the said member and the last recited ends of the said arms one With respect to the other, and resilient means cooperating 'with the last said ends of the said arms and the said member 'For normally eentralizing and cushioning the longitudinal forces ot the said member and the ends of the arms n'ithrespect to cach other.

In a spring suspension 'tor vehicles, a load supportingl mei'nbei, opposed load supporting arms therebeloiv, means pivotally connecting one end oll the arms to the vehicle running gear, means connecting the other ends ot the arms with the said member for pivotal movement and also for movement with respect to the said men'iber in directions transvei'se to the axis oi the pivots, the last recited means also permitting a relative lateral movement ot the arms and said member one with relation to the other, and means or limiting the first recited pivotal movement ot' the arms and member with respect to each other.

H. ln a spring suspension for vehicles, a load supporting' member, opposed load supporting arms therebelon', means pivotally connecting one end ot the arms to the vehicle running gear, means connecting the other ends ot the arms with the said member for pivotal moveinent and also for movement with respect to the said member in directions transverse to the axis of the pivots, the last recited means also permitting a relative lateral movement of the arms and said member one with relation to the other, cushioning means interposed between the said member and the respective said arms and intermediate the ends of the latter, and means for limiting the iirst recited pivotal movement of the arms and member with respect to each other. Y

Si. ln a spring suspension tor vehicles, a load supporting member, opposed load supporting arms therebelo-iv, means pivotally connecting one end of the arms to the vehicle running gear, means connecting the other ends ot the arms With the said member for pivotal movement and also for movement With respect to the said member in directions transverse to the axis of the pivots, the last recited means also permitting a relative lateral movement of the arms and said member one with relation to the other, means for limiting the irst recited pivotal movement of the arms and member with respect to each other, and means for cushioning the said relative longitudinal movement, the last recited means tending to normally centralize the pivotal point of connection between the ends of the arms and the load supporting member.

10. In a spring suspension for vehicles a load supporting member, opposed load supporting arms tlierebeloiv, means pivotally connecting one end of the arms to the vehicle running` gear, a beaiing member connected with the iirst said member, and bearings slidably and rotatabhv mounted upon the bearing member and to which bearings the other ends et the respective arms are connected for pivotal movement with respect thereto on axes transverse to the longitudinal axis oi the said bearing member.

11. In a spring suspension ttor vehicles a load supporting member, opposed load supporting arms therebelow, means pivotally connecting one end of the arms to the vehicle running gear, a bearing member connected with the tirst said member, bearings slidably and rotatably mounted upon the bearing .n'iember and to which bearings the other ends of the respective arms are connected 'for pivotal movement with respect thereto on axes transverse to the longitudinal aXis of the said bearing member, and means for limiting the relative pivotal movement of the said arms and the said load supporting member. y

12. In a spring suspension for vehicles a load supporting member, opposed load supporting arms therebelow, means pivotally connecting` one end ot the arms to the vehicle running gear, a bearing member connected with the first said member, bearings slidably and rotatably mounted upon the bearing member and to which bearings the other ends of the respective arms are connected for pivotal movement with respect thereto on aXes transverse to the longitudinal aXis of the said bearing member, and cushioning means interposed between the said load supporting member and the respective arms and intermediate the ends oi' the latter.

13. In a spring suspension for vehicles, a load supporting member, opposed load supporting arms therebelow, means pivotally connecting one end of the arms to the vehicle running gear, a bearing member connected with the first. said member, bearings slidably and rotatably mounted upon the bearing member and to which bearings the other ends ot the respective arms are connected for pivotal movement with respect thereto on axes transverse to the longitudinal axis of the said bearing member, and resilient means interposed betweenthe said bearings and the said load supporting member and tending to eentralize the `pivotabpomt ot connection between the ends ot' the arms and the load supporting member.

111. In a spring suspension for vehicles, a load supporting member, opposed loadsupporting arms therebelow, means pivotally connecting one end of the arms to the vehicle running gear, a bearing member connected with. the first said member, bearings slidably and rotatably mounted upon the bearing member and to which bearings the other ends of the respective arms are connected for pivotal movement with respect thereto on axes transverse to the longitudinal axis of thesaid bearing member, 'and resilient means individual to the said bearings, encompassing the said bearing member and interposed between the respective bearings and the said load supporting member and. operating to cushion the said bearings and tending to normally centralize vthe point 'of pivotal connection oi' the said arms with the load supporting member.

15. In a spring suspension for vehicles, a load supporting member, opposed load supporting arms therebelow, means pivotally connecting one end ot the arms to the vehicle running gear, a bearing member connected with the lirst said member, bearings slidably and rotatably mounted upon the bearing member and to which bearings the other ends of the respective arms are connected for pivotal move-ment with respect thereto on axes transverse to the longitudinal axis of the said bearing member, and means for lubricating the said bearings through the said bearing` member.

16. In' a springl suspension 'for vehicles, a load supporting member, opposed load supporting arms therebelow, means pivotally connecting one end of the arms to the vehicle running gear, a bearing member connected with the first said membenbearmgs slidably and rotatably mounted upon the bearing member and to which bearings the other ends of the respective arms are connected for pivotal move-ment with respect thereto on axes transverse t-o the longitudinal anis of the said bearing member, resilient means interposed between the load supporting member and the respective arms and intermediate the ends of the latter, and means for limiting the pivotal movement ci: the arms and load supporting member towards and away from each other.

17. In a spring suspension tor vehicles, a load supporting member, opposed load supporting arms therebelow, means pivotally connecting` one end ot the arms to the vehicle running` gear, a bearing member connected with the iirst said member, bearings slidably and rotatably mounted upon the bearing member and to' which bearings the other ends of the respective arms are 'connected tor pivotal movement with respect thereto on axes transverse to the longitudinal axis of the said bearing member, resilient means interposed between the load supporting member and the respective arms and intermediate the ends of the latter, and means for limiting the pivotal movement of the arms and load supporting member towards and away from each other, the last recited means including a connecting bar yieldably connected with one of the last two recited parts and yieldingly connected with the other of said parts.

18. In a spring sus ension for vehicles, a load supporting mem er, a load supporting armA therebelow, means pivotally connecting 130 one end of the arm with the vehicle running gear, means connecting the other end of the arm with the said. men'iber Yfor a pivotal, a longitudinal and a lateral swivel action with respect thereto, a resilient member interposed between the load supporting member and the arm intermediate the ends ot the latter, and means for limiting the pivotal movement ot the said member and arm one with respect to the other. the last said means including a shouldered rod, said shoulder loosely engaging one of the parts, said rod passing loosely through the other part, an adjusth able collar on the end ot' the rod, and a resilient element encompassing the rod and engaging the collar and the other of the parts.

19. In a spring suspension for vehicles, a load supporting member, a load supporting arm therebelow, means pivotally connecting the respective ends of the arm with the vehicle running gear and the said member, aresilient element interposed between the said member and the Said arm intermediate the ends ot the latter, means tor limiting the relative pivotal movement o't the arm and member` the last said means including a shouldered rod passing loosely through the said member with the head engaging the member, the other end ot the rod passing through and beyond said arm, a collar on the end of the rod, a member loosely encompassing the rod and abutting the said collar, a second resilient element interposed between the last said member and the said arm, and a third resilient element interposed between the last said member and the said arm, the last said resilient element operating to maintain the said second resilient element seated against the said arm when the said collar on the said rod moves away vtrom the said arm.

20. In a spring suspension 'tor vehicles, a load supporting member, a load supporting arm therebelow, means pivotally connecting the ends of the arm respectively with said member and the vehicle running gear, a resilient element interposed between the said member and thearm and intermediate the ends of the latter, means :tor limiting the relative movement of the arm and member, said means including a rod connected with the said member and passing loosely through and beyond the arm, collar on the end of the rod, a member loosely encompassing the rod and engaging` the collar, a second resilient element encompassing` the rod and engaging the arm and the last said member, and a third resilient element encompassing the rod and engaging the second recited member and the said collar. v

21. In a spring suspension for vehicles, a load supporting member, a load supporting` arm therebelow, means pivotallv connecting the ends oi the arm respectively with said member and the vehicle running gear, a resilient element interposed between the said member and the arm and intermediate the ends orP the latter, means for limiting the relative movement of the arm and member, r

said means including a rod connected with the said member and passing loosely through and beyond the arm, a collar on the end oi' the rod, a member loosely encompassing the rod and engaging the collar, a second resilient element encompassing the rod and engaging the arm and the last said member, a third resilient element encompassing the rod and engaging the second recited member and the said collar, and a noise deadening element interposed between the said collar and the last recited member.

22. In a spring suspension for vehicles, a load supporting member, a load supporting arm therebelow, means pivotally connecting the ends of the arm respectively with said member and the vehicle running gear, a resilient element interposed between the said member and the arm and intermediate the ends of the latter, means for limiting the relative movement of the arm and member, said means including a rod connected with the said member and passing loosely through and beyond the arm, a collar on the end ot the rod, a member loosely encompassing the rod and engaging the collar, a second resilient element encompassing the rod and engaging the arm and the last said member, a third resilient element encompassing the rod and engaging the second recited member and the said collar, the said rod having a shoulder seated iu a recess in the load supporting member, and means in the recess for holding the shoulder seated.

23. In a spring suspension for vehicles, a load supporting member, a load supporting arm therebelow, means pivotally connecting the ends oi the arm respectively with said member and the vehicle running gear, a resilient element interposed between the said member and the arm and intermediate the ends ot the latter, means for limiting the relative movement of the arm and member, said means including a rod connected with the said member and passing loosely through and beyond the arma, a collar on the end of the rod, a member loosely encompassing the rod and engaging the collar, a second resilient element encompassing the rod and engaging the arm and the last said member, a third resilient element encompassing the rod and engaging the second recited member and the said collar, the said rod having a shoulder seated in a recess in the load supporting member, a closure for the recess and resilient means interposed between the rod and the said closure tor holding the said shoulder seated.

24e. In a spring suspension for vehicles, a load supporting member, a load supporting llO arm therebeloW, means pivotally connecting y the ends of the arm respectively with said member and the vehicle running gear, a resilient element interposed between the said member and the arm and intermediate the ends of the latter, means for limiting the relative movement oit the arm and member, said means including a rod ccnnected with the said member and passing loosely7 through and beyond the arm, a collar on the end of the rod, a member loosely encompassino` the rod and engaging the collar, a secon resilient element encompassing the rod and engaging the arm and the last said member, a third resilient element encompassing the rod and engaging the second recited member and the said collar, the said rod having a shoulder seated in a recess in the load supporting member, and means in the recess for holding the shoulder seated, the said recess being adapted to hold a lubricant for the end of the rod.

In testimony whereof I have signed my name to this specification October, A. D.

RANSOM Y. BOVEE. 

